GE MM300 Manual page 19
Motor management system/low voltage motor protection and control
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Also See for MM300:
- Instruction manual (198 pages) ,
- Quick start manual (77 pages) ,
- Installation recommendations (21 pages)
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CHAPTER 2: RS485 INTERFACE (MODBUS RTU)
Modbus
Hex
Description
30207
00CE
Pre Trip Vca
30208
00CF
Pre Trip Van
30209
00D0
Pre Trip Vbn
30210
00D1
Pre Trip Vcn
30211
00D2
Pre Trip System Frequency
30212
00D3
Pre Trip Real Power
30214
00D5
Pre Trip Reactive Power
30216
00D7
Pre Trip Apparent Power
30217
00D8
Pre Trip Power Factor
30218
00D9
Reserved
▼
▼
▼
30222
00DD
Reserved
REAL-TIME CLOCK
30223
00DE
Weekday
30224
00DF
Date Read Only
30226
00E1
Time Read Only
30228
00E3
Daylight Savings Active
30229
00E4
Reserved
TRIP COUNTERS
30230
00E5
Total Number of Trips
30232
00E7
Overload Trips
30233
00E8
Mechanical Jam Trips
30234
00E9
Undercurrent Trips
30235
00EA
Current Unbalance Trips
30236
00EB
Ground Fault Trips
30237
00EC
Motor Acceleration Trips
30238
00ED
Undervoltage Trips
30239
00EE
Overvoltage Trips
30240
00EF
Voltage Phase Reversal Trips
30241
00F0
Voltage Freq Trips
30242
00F1
Underpower Trips
30243
00F2
Reserved
▼
▼
▼
30256
00FF
Reserved
GENERAL TIMERS
30257
0100
Number of Motor Starts
30258
0101
Number of UV Restarts
30259
0102
Motor Running Hours
30261
0104
UVR Timer
30262
0105
Start Timer 1
30263
0106
Start Timer 2
30264
0107
Start Timer 3
30265
0108
Start Timer 4
30266
0109
Start Timer 5
30267
010A
TransferTimer
30268
010B
Power Loss Time
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Min
Max
Step
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0
0xFFFF
1
MODBUS MEMORY MAP
Units
Format Default
V
F1
N/A
V
F1
N/A
V
F1
N/A
V
F1
N/A
Hz
F3
N/A
kW
F13
N/A
kvar
F13
N/A
kVA
F2
N/A
---
F21
N/A
---
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---
▼
▼
▼
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---
FC171
N/A
---
F18
N/A
---
F19
N/A
---
FC126
N/A
---
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---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
F1
N/A
---
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▼
▼
▼
---
F1
N/A
---
F1
N/A
hrs
F9
N/A
s
F1
N/A
s
F1
N/A
s
F1
N/A
s
F1
N/A
s
F1
N/A
s
F1
N/A
s
F1
N/A
ms
F1
0
Size in
Words
1
1
1
1
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2
2
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1
▼
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2
2
1
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▼
1
1
1
2
1
1
1
1
1
1
1
1
2–11
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Table of Contents
Need help?
Do you have a question about the MM300 and is the answer not in the manual?
Questions and answers
we have a problem with device MM300. it says that the device is invalid through the software and does not read the device. the communication is through RS 485. is it possible to give us an advice or send us some reccomendations or instructions?
For a GE MM300 device that is not recognized by software and communicates via RS485, follow these troubleshooting steps:
1. Ensure correct RS485 wiring:
- Use two-wire RS485 in a daisy chain configuration.
- Install a 120 Ohm resistor in series with a 1 nF ceramic capacitor at each end of the link.
- Use shielded wire and ground the shield at only one location.
2. Check device addressing and termination:
- Confirm proper device address and ensure no address conflicts.
- Verify that termination networks are correctly installed at both ends.
3. Confirm half-duplex communication:
- Ensure that the system supports half-duplex communication and not sending and receiving data simultaneously.
4. If using USB for setup (e.g., USB-to-RS485 converter) and the device is not recognized:
- Repeat the connection procedure 2–3 times.
- If still not recognized, uninstall the USB driver from Device Manager under modems.
- Disconnect the USB cable, wait at least 10 seconds, then reconnect.
- When prompted by the Hardware Wizard, select "No, not this time," then "Install the software automatically," and press "Continue Anyway."
- Finish the installation and check if the USB device appears in the setup software.
These steps help ensure proper hardware connection and correct software recognition of the MM300 device.
This answer is automatically generated